Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study

Kelishadi, Roya and Qorbani, Mostafa and Motlagh, Mohammad Esmaeil and Heshmat, Ramin and Poursafa, Parinaz and Bahreynian, Maryam (2016) Prevalence of Vitamin D Deficiency according to Climate Conditions among a Nationally Representative Sample of Iranian Adolescents: the CASPIAN-III Study. International Journal of Pediatrics, 4 (6). pp. 1903-1910.

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Abstract

Background: Sunlight is the main source of vitamin D; therefore, environmental factors might have an important role in the high prevalence of hypovitaminosis D in children. This study aimed to assess the vitamin D status according to the climate of the living area in a nationally representative sample of Iranian adolescents. Material and Methods: This nationwide cross-sectional survey was performed among a representative sample of 1,095adolescents aged 10-18 years, selected by multistage cluster sampling method from 27 provinces of Iran. Serum 25-hydroxyvitamin D 25(OH) D concentrations was compared in inhabitants of humid-rainy, cold-mountainous, and sunny regions. Results: Vitamin D deficiency was documented in 40% of participants including 40.70% of boys and 39.30% of girls. We found significant difference in 25(OH) D concentrations among participants living in the three different climates of the living area (P<0.05). The median inter-quartile range (IQR) level for 25(OH)D was lower in humid-rainy climate: 11.40 (18.64). Hypovitaminosis D was more frequent in humid-rainy climate (42.30%), compared to other climates; this difference was more prominent in urban areas (P<0.05). Boys living in various climates had significantly different levels of 25(OH) D(P<0.05), however this figure was not significantly different for girls (P>0.05). The highest frequency of hypovitaminosis D (45.2%) was documented among boys living in humid-rainy regions. Conclusion: The high prevalence of hypovitaminosis D, notably among inhabitants of humid-rainy region underscores the necessity of implementing national preventive strategies. This is of great importance especially in regions with lower exposure to sunlight.

Item Type: Article
Subjects: WA Public Health
WS Pediatrics
Divisions: Journals > International J Pediatrics
Depositing User: IJP IJP
Date Deposited: 27 Sep 2017 13:05
Last Modified: 27 Sep 2017 13:05
URI: http://eprints.mums.ac.ir/id/eprint/5039

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